Preheat oven to 450°.
Arrange squash in a single layer on a jelly roll pan coated with cooking spray. Drizzle with 1 1/2 teaspoons oil; toss well to coat. Bake at 450° for 25 minutes or until lightly browned. Set aside.

The secret to rich stock is roasting the bones and vegetables. To encourage caramelization, cut the carcass into pieces that lie as flat as possible in the pan. If your turkey was larger than 12 pounds, you may have to cut it into smaller pieces than the recipe instructs.